Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a3ce98c68b1d16…

MALICIOUS

PDF

67.8 KB Created: 2020-12-08 10:39:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 40f83d6ee4633cbd4c9712c48c334a71 SHA-1: de538efd905bf5aae330d94a3add196981ebec84 SHA-256: 87a3ce98c68b1d16560b1ecec51086c3a43ac5512daeb3afb9cebf5f0797cb0d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffine.ru/strik?utm_term=mario+games+google+search PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387240/normal_5f9c7d61823a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451355/normal_5fce31782d77b.pdfIn PDF document text
    • https://narebojabow.weebly.com/uploads/1/3/4/2/134266185/d3b456.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422161/normal_5fcc920ef1a88.pdfIn PDF document text
    • https://dugigoje.weebly.com/uploads/1/3/4/7/134754128/xanekopegex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc789d6f140fc3aa58a2e7b/t/5fcda286c836a917f9292376/1607312006731/song_trivia_lucky_quiz_game.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc11cf00a2757459be424fe/t/5fcc7b3674a40730fb926531/1607236407824/can_apple_block_my_iphone.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1b53fc6229360ecb2a747/t/5fceffcf01eaf4591e1f84ff/1607401423811/nihilumbra_full_version_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2af098a0-b1ac-4783-9187-d2cabcde403b/pokemon_y_rom_randomizer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/050a54c1-67ab-4a07-a0f7-5c0b11f5fecb/football_clubs_logo_quiz_answers_level_1.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4ec19b1ed03538d180d8/1606373057513/xawulazesegabelixa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90dd9cdf-e563-4a25-ae0a-17eff0bee3e8/68615937870.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc10f0fab79f442f22a8155/t/5fc47873e18c5c478e8abd0d/1606711412118/korid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/698f616b-7593-4668-a9ae-ecb8ac685459/71185086909.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCED 5220 bytes
SHA-256: fb75afd881cb062240f4e3d749ddd5802c032f0347a1af3906dc00a07f62675d
font_01_sfnt_off0000de8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8D 10656 bytes
SHA-256: 5b7af612ee6928bc41b4d4f99c9094b37a6b119a922c2d86236c35bb5d4ec02b

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